Patents by Inventor Iain Rookes

Iain Rookes has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electro-magnetically operated valve
    Patent number: 5992821
    Abstract: An electro-magnetically operated valve which has a pole piece, an armature member mounted for movement relative to the pole piece, and an electro-magnetic device associated with the pole piece for effecting movement of the armature member between a first position spaced from the pole piece to a second position where the armature member contacts the pole piece, where at least a portion of the armature member and/or the pole piece has in or on a coating or layer of material having a higher mechanical hardness or a higher magnetic permeability than the material of the armature and/or pole piece.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: November 30, 1999
    Assignee: Perkins Engines Company Limited
    Inventors: Iain Rookes, Paul John Smith, Daniel Charmbury Ward